Malicious PDF — malware analysis report

Static analysis result for SHA-256 661e78dc97e12182…

MALICIOUS

PDF

83.6 KB Created: 2021-05-14 01:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a826b35b9ca779698d8e15bd0f806178 SHA-1: 72d00e3e2242f935cb87cfbfb8ccff9ce57a1fe0 SHA-256: 661e78dc97e12182b705aefb8ddb9856ea769dc5189545076706e2a8ccb0204e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. One of the embedded URLs, 'https://baarspo.ru/strik?utm_term=how+to+use+commas+and+semicolons', is particularly suspicious and likely serves as a lure or initial redirection point. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=how+to+use+commas+and+semicolons PDF link annotation
    • https://cdn.sqhk.co/dugelabomaw/QA3lget/bird_box_2_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/OjcLnDY/mame_shooting_games.pdfIn PDF document text
    • http://4escam-bot.online/xujigutemokaro1hstm.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/jiU3mia/gotinaxiserulerexalujex.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/jiRSu4K/ffx_monster_arena_item_drop_list.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/mihieju/23779489679.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/h8LdioF/mathematics_book_for_class_8.pdfIn PDF document text
    • http://italia-doc.space/a_writers_year_365_creative_writing_prompts0x9tr.pdfIn PDF document text
    • http://temppicture.xyz/coriolis_flow_meter_installation_guidengrsx.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/vertical_farming_business_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/XmL7gdk/notar.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/gastrointestinal_system_examination.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/hagjhaF/dajizafowugoreluwave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_2955cdad88fd4ce8b251852979f66b66.pdf?index=trueIn PDF document text
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_5d41c4fa9ac44eb6aa819f00105273ea.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_c1b81c815d7749a197a60ed1c1452ede.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_0039cbb7050d4c40b18e17e896274d30.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_f9e86523e88e4db6b40682bbf0a1969d.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_9c11b05effe5403ba26a3e3422c1360c.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_249a77c4c062452287ac10f502890e8d.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_043081259d3b4a1ab722fb421ac296a9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 3092 bytes
SHA-256: 8fedf83148a78bbf059abbbbd7b22f0256d0266240e9913446cefdb1a629cd89
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 4924 bytes
SHA-256: 659168f368e0d266997300a1771855bb8a9f42f1f7c2e9fb6286e8923dba8b5d
font_02_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 11236 bytes
SHA-256: d82a7a49d505aa882ee1a61ee04dab7cdb124bcaf541d5affd22b5f6a894cd33
font_03_sfnt_off0001305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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